text: import numpy as np
  import matplotlib.pyplot as plt
  from mpl_toolkits.mplot3d import Axes3D
  
  
  X, Y = np.meshgrid(np.arange(0,200,1), np.arange(0,200,1))
  
  # get 2D z data
  Z = np.loadtxt("a.csv", delimiter=",")
  
  fig = plt.figure()
  ax = fig.add_subplot(111, projection='3d')
  
  ax.plot_surface(X, Y, Z)
  
  plt.show()